12583 + Mcqs in Physics Page 216 McqOptions

10751.	A motor having an armature of resistance \[2\Omega \] is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is [UPSEAT 2002]
A.	5A
B.	105A
C.	110A
D.	215A
Answer» B. 105A

Discussion

10752.	Which one of these is non-divisible [KCET 1994]
A.	Nucleus
B.	Photon
C.	Proton
D.	Atom
Answer» C. Proton

Discussion

10753.	An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero is [Orissa JEE 2003]
A.	50 sec
B.	0.02 sec
C.	5 sec
D.	\[5\times {{10}^{-3}}\] sec
Answer» E.

Discussion

10754.	For depositing 1 gm of Cu in copper voltameter on passing 2 amperes of current, the time required will be (For copper Z = 0.00033 gm/C)
A.	Approx. 20 minutes
B.	Approx. 25 minutes
C.	Approx. 30 minutes
D.	Approx. 35 minutes
Answer» C. Approx. 30 minutes

Discussion

10755.	Assertion : Voltameter measures current more accurately than ammeter. Reason : Relative error will be small if measured from voltameter.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10756.	A tuning fork gives 4 beats with 50 cm length of a sonometer wire. If the length of the wire is shortened by 1 cm, the number of beats is still the same. The frequency of the fork is [MP PMT 2001]
A.	396
B.	400
C.	404
D.	384
Answer» B. 400

Discussion

10757.	It is possible to hear beats from the two vibrating sources of frequency [UPSEAT 2001]
A.	100 Hz and 150 Hz
B.	20 Hz and 25 Hz
C.	400 Hz and 500 Hz
D.	1000 Hz and 1500 Hz
Answer» C. 400 Hz and 500 Hz

Discussion

10758.	In S.H.M. maximum acceleration is at [RPET 2001; BVP 2003]
A.	Amplitude
B.	Equilibrium
C.	Acceleration is constant
D.	None of these
Answer» B. Equilibrium

Discussion

10759.	Assertion : The difference in the value of acceleration due to gravity at pole and equator is proportional to square of angular velocity of earth. Reason : The value of acceleration due to gravity is minimum at the equator and maximum at the pole.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» C. If assertion is true but reason is false.

Discussion

10760.	Assertion : In isothermal process whole of the heat energy supplied to the body is converted into internal energy. Reason : According to the first law of thermodynamics \[\Delta Q=\Delta U+p\Delta V\]. [AIIMS 1997]
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» F.

Discussion

10761.	Advantage of optical fibre [DCE 2005]
A.	High bandwidth and EM interference
B.	Low bandwidth and EM interference
C.	High band width, low transmission capacity and no EM interference
D.	High bandwidth, high data transmission capacity and no EM interference
Answer» E.

Discussion

10762.	Assertion : Angle between \[\hat{i}+\hat{j}\text{ and }\hat{i}\] is 45° Reason : \[\hat{i}+\hat{j}\text{ }\]is equally inclined to both \[\hat{i}\] and \[\hat{j}\text{ }\]and the angle between \[\hat{i}\] and \[\hat{j}\text{ }\]is 90°
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10763.	Which of the following is not the property of a cathode ray [CBSE PMT 2002]
A.	It casts shadow
B.	It produces heating effect
C.	It produces flurosence
D.	It does not deflect in electric field
Answer» E.

Discussion

10764.	If mass of a body is M on the earth surface, then the mass of the same body on the moon surface is [AIIMS 1997; RPMT 1997; JIPMER 2000]
A.	M/6
B.	Zero
C.	M
D.	None of these
Answer» D. None of these

Discussion

10765.	Assertion : The energy and momentum (p) of a photon are related by \[p=E/c\]. Reason : The photon behaves like a particle. [AIIMS 2005]
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10766.	The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by [MP PET 1994]
A.	\[\|B\|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{2i}{r}\]
B.	\[\|B\|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{r}{2i}\]
C.	\[\|B\|\,=\left( \frac{4\pi }{{{\mu }_{0}}} \right)\frac{2i}{r}\]
D.	\[\|B\|\,=\left( \frac{4\pi }{{{\mu }_{0}}} \right)\frac{r}{2i}\]
Answer» B. \[\|B\|\,=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\frac{r}{2i}\]

Discussion

10767.	A research satellite of mass 200 kg circles the earth in an orbit of average radius 3R/2 where R is the radius of the earth. Assuming the gravitational pull on a mass of 1 kg on the earth?s surface to be 10 N, the pull on the satellite will be [Kerala (Engg.) 2002]
A.	880 N
B.	889 N
C.	890 N
D.	892 N
Answer» B. 889 N

Discussion

10768.	The frequency of a rod is 200 Hz. If the velocity of sound in air is \[340\,m{{s}^{-1}}\], the wavelength of the sound produced is [EAMCET (Med.) 1995; Pb. PMT 1999; CPMT 2000]
A.	1.7 cm
B.	6.8 cm
C.	1.7 m
D.	6.8 m
Answer» D. 6.8 m

Discussion

10769.	In a medium sound travels 2 km in 3 sec and in air, it travels 3 km in 10 sec. The ratio of the wavelengths of sound in the two media is [NTSE 1995]
A.	1 : 8
B.	1 : 18
C.	8 : 1
D.	20 : 9
Answer» E.

Discussion

10770.	Frequency range of the audible sounds is [EAMCET (Med.) 1995; RPMT 1997]
A.	0 Hz ? 30 Hz
B.	20 Hz ? 20 kHz
C.	20 kHz ? 20,000 kHz
D.	20 kHz ? 20 MHz
Answer» C. 20 kHz ? 20,000 kHz

Discussion

10771.	In a series circuit R = 300 W, L = 0.9 H, C = 2.0 mF and w = 1000 rad/sec. The impedance of the circuit is [MP PMT 1995]
A.	1300 W
B.	900 W
C.	500 W
D.	400 W
Answer» D. 400 W

Discussion

10772.	The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings) [MP PMT 2000]
A.	\[2\pi hc/{{e}^{2}}\]
B.	\[{{e}^{2}}h/2\pi c\]
C.	\[{{e}^{2}}c/2\pi h\]
D.	\[2\pi {{e}^{2}}/hc\]
Answer» E.

Discussion

10773.	The mass of ions deposited during a given interval of time in the process of electrolysis depends on [DPMT 2002]
A.	The current
B.	The resistance
C.	The temperature
D.	The electric power
Answer» B. The resistance

Discussion

10774.	Assertion : Short wave bands are used for transmission of radio waves to a large distance. Reason : Short waves are reflected by ionosphere [AIIMS 1994]
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10775.	The ground state energy of hydrogen atom is ? 13.6 eV. What is the potential energy of the electron in this state [AIIMS 2005]
A.	0 eV
B.	? 27.2 eV
C.	1 eV
D.	2 eV
Answer» C. 1 eV

Discussion

10776.	A and B are two concentric circular conductors of centre O and carrying currents \[{{I}_{1}}\] and \[{{i}_{2}}\] as shown in the adjacent figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at O due to A and B is 1 : 3, then the value of \[{{i}_{1}}/{{i}_{2}}\] is [KCET 2000]
A.	\[\frac{1}{6}\]
B.	\[\frac{1}{4}\]
C.	\[\frac{1}{3}\]
D.	\[\frac{1}{2}\]
Answer» B. \[\frac{1}{4}\]

Discussion

10777.	The vector sum of two forces is perpendicular to their vector differences. In that case, the forces [CBSE PMT 2003]
A.	Are equal to each other in magnitude
B.	Are not equal to each other in magnitude
C.	Cannot be predicted
D.	Are equal to each other
Answer» B. Are not equal to each other in magnitude

Discussion

10778.	Assertion : A point charge is brought in an electric field. The field at a nearby point will increase, whatever be the nature of the charge. Reason : The electric field is independent of the nature of charge.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» E. If assertion is false but reason is true.

Discussion

10779.	Assertion : The temperature coefficient of resistance is positive for metals and negative for p-type semiconductor. Reason : The effective charge carriers in metals are negatively charged whereas in p-type semiconductor they are positively charged. [AIIMS 1996]
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» C. If assertion is true but reason is false.

Discussion

10780.	Two bodies with kinetic energies in the ratio of 4 : 1 are moving with equal linear momentum. The ratio of their masses is [CBSE PMT 1999]
A.	1 : 2
B.	1 : 1
C.	4 : 1
D.	1 : 4
Answer» E.

Discussion

10781.	The mechanical equivalent of heat J is [MP PET 2000]
A.	A constant
B.	A physical quantity
C.	A conversion factor
D.	None of the above
Answer» D. None of the above

Discussion

10782.	A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose density and radius are, respectively, one-quarter and one-third that of planet A [AMU (Med.) 2001]
A.	1.5 m
B.	15 m
C.	18 m
D.	28 m
Answer» D. 28 m

Discussion

10783.	The factor not needed to calculate heat lost or gained when there is no change of state is [AFMC 1997; BHU 1997]
A.	Weight
B.	Specific heat
C.	Relative density
D.	Temperature change
Answer» D. Temperature change

Discussion

10784.	The average power dissipation in a pure capacitance in ac circuit is [DPMT 1987; MP PMT/PET 1998]
A.	\[\frac{1}{2}C{{V}^{2}}\]
B.	\[C{{V}^{2}}\]
C.	\[\frac{1}{4}C{{V}^{2}}\]
D.	Zero
Answer» E.

Discussion

10785.	The electrochemical equivalent Z of any element can be obtained by multiplying the electrochemical equivalent of hydrogen with
A.	Atomic weight
B.	Molecular weight
C.	Chemical equivalent
D.	A constant
Answer» D. A constant

Discussion

10786.	Electroplating does not help in [AIIMS 1998]
A.	Fine finish to the surface
B.	Shining appearance
C.	Metals to become hard
D.	Protect metal against corrosion
Answer» D. Protect metal against corrosion

Discussion

10787.	When the distance between the charged particles is halved, the force between them becomes [MNR 1986]
A.	One-fourth
B.	Half
C.	Double
D.	Four times
Answer» E.

Discussion

10788.	Assertion : A dish antenna is highly directional. Reason : This is because a dipole antenna is omni directional.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» C. If assertion is true but reason is false.

Discussion

10789.	Assertion : Magnetic moment of helium atom is zero. Reason : All the electron are paired in helium atom orbitals.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10790.	The capacitance of an air capacitor is \[15\mu F\]the separation between the parallel plates is\[6mm\]. A copper plate of \[3mm\] thickness is introduced symmetrically between the plates. The capacitance now becomes [MP PMT 1995]
A.	\[5\mu F\]
B.	\[7.5\mu F\]
C.	\[22.5\mu F\]
D.	\[30\mu F\]
Answer» E.

Discussion

10791.	Assertion : The basic of Laplace correction was that, exchange of heat between the region of compression and rarefaction in air is not possible. Reason : Air is a bad conductor of heat and velocity of sound in air is large.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» D. If the assertion and reason both are false.

Discussion

10792.	Assertion : For a floating body to be in stable equilibrium, its centre of buoyancy must be located above the centre of gravity. Reason : The torque produced by the weight of the body and the upthrust will restore body back to its normal position, after the body is disturbed.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10793.	Assertion : Particle velocity and wave velocity both are independent of time. Reason : For the propagation of wave motion, the medium must have the properties of elasticity and inertia.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» F.

Discussion

10794.	The characteristic impedance of a coaxial cable is of the order of [CPMT 2003]
A.	50 W
B.	200 W
C.	270 W
D.	None of these
Answer» D. None of these

Discussion

10795.	The force constant of a weightless spring is 16 N/m. A body of mass 1.0 kg suspended from it is pulled down through 5 cm and then released. The maximum kinetic energy of the system (spring + body) will be [MP PET 1999; DPMT 2000]
A.	\[2\times {{10}^{-2}}\,J\]
B.	\[4\times {{10}^{-2}}\,J\]
C.	\[8\times {{10}^{-2}}\,J\]
D.	\[16\times {{10}^{-2}}\,J\]
Answer» B. \[4\times {{10}^{-2}}\,J\]

Discussion

10796.	Field at the centre of a circular coil of radius r, through which a current I flows is [MP PMT 1993]
A.	Directly proportional to r
B.	Inversely proportional to I
C.	Directly proportional to I
D.	Directly proportional to \[{{I}^{2}}\]
Answer» D. Directly proportional to \[{{I}^{2}}\]

Discussion

10797.	Assertion : Sound would travel faster on a hot summer day than on a cold winter day. Reason : Velocity of sound is directly proportional to the square of its absolute temperature.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» D. If the assertion and reason both are false.

Discussion

10798.	If two conducting spheres are separately charged and then brought in contact [NCERT 1979]
A.	The total energy of the two spheres is conserved
B.	The total charge on the two spheres is conserved
C.	Both the total energy and charge are conserved
D.	The final potential is always the mean of the original potentials of the two spheres
Answer» C. Both the total energy and charge are conserved

Discussion

10799.	When a gas expands adiabatically [CPMT 1990]
A.	No energy is required for expansion
B.	Energy is required and it comes from the wall of the container of the gas
C.	Internal energy of the gas is used in doing work
D.	Law of conservation of energy does not hold
Answer» D. Law of conservation of energy does not hold

Discussion

10800.	Assertion : There is no dispersion of light refracted through a rectangular glass slab. Reason : Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» C. If assertion is true but reason is false.

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

A motor having an armature of resistance \[2\Omega \] is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is [UPSEAT 2002]

Which one of these is non-divisible [KCET 1994]

An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero is [Orissa JEE 2003]

For depositing 1 gm of Cu in copper voltameter on passing 2 amperes of current, the time required will be (For copper Z = 0.00033 gm/C)

Assertion : Voltameter measures current more accurately than ammeter. Reason : Relative error will be small if measured from voltameter.

A tuning fork gives 4 beats with 50 cm length of a sonometer wire. If the length of the wire is shortened by 1 cm, the number of beats is still the same. The frequency of the fork is [MP PMT 2001]

It is possible to hear beats from the two vibrating sources of frequency [UPSEAT 2001]

In S.H.M. maximum acceleration is at [RPET 2001; BVP 2003]

Assertion : The difference in the value of acceleration due to gravity at pole and equator is proportional to square of angular velocity of earth. Reason : The value of acceleration due to gravity is minimum at the equator and maximum at the pole.

Assertion : In isothermal process whole of the heat energy supplied to the body is converted into internal energy. Reason : According to the first law of thermodynamics \[\Delta Q=\Delta U+p\Delta V\]. [AIIMS 1997]

Advantage of optical fibre [DCE 2005]

Assertion : Angle between \[\hat{i}+\hat{j}\text{ and }\hat{i}\] is 45° Reason : \[\hat{i}+\hat{j}\text{ }\]is equally inclined to both \[\hat{i}\] and \[\hat{j}\text{ }\]and the angle between \[\hat{i}\] and \[\hat{j}\text{ }\]is 90°

Which of the following is not the property of a cathode ray [CBSE PMT 2002]

If mass of a body is M on the earth surface, then the mass of the same body on the moon surface is [AIIMS 1997; RPMT 1997; JIPMER 2000]

Assertion : The energy and momentum (p) of a photon are related by \[p=E/c\]. Reason : The photon behaves like a particle. [AIIMS 2005]

The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by [MP PET 1994]

A research satellite of mass 200 kg circles the earth in an orbit of average radius 3R/2 where R is the radius of the earth. Assuming the gravitational pull on a mass of 1 kg on the earth?s surface to be 10 N, the pull on the satellite will be [Kerala (Engg.) 2002]

The frequency of a rod is 200 Hz. If the velocity of sound in air is \[340\,m{{s}^{-1}}\], the wavelength of the sound produced is [EAMCET (Med.) 1995; Pb. PMT 1999; CPMT 2000]

In a medium sound travels 2 km in 3 sec and in air, it travels 3 km in 10 sec. The ratio of the wavelengths of sound in the two media is [NTSE 1995]

Frequency range of the audible sounds is [EAMCET (Med.) 1995; RPMT 1997]

In a series circuit R = 300 W, L = 0.9 H, C = 2.0 mF and w = 1000 rad/sec. The impedance of the circuit is [MP PMT 1995]

The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings) [MP PMT 2000]

The mass of ions deposited during a given interval of time in the process of electrolysis depends on [DPMT 2002]

Assertion : Short wave bands are used for transmission of radio waves to a large distance. Reason : Short waves are reflected by ionosphere [AIIMS 1994]

The ground state energy of hydrogen atom is ? 13.6 eV. What is the potential energy of the electron in this state [AIIMS 2005]

A and B are two concentric circular conductors of centre O and carrying currents \[{{I}_{1}}\] and \[{{i}_{2}}\] as shown in the adjacent figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at O due to A and B is 1 : 3, then the value of \[{{i}_{1}}/{{i}_{2}}\] is [KCET 2000]

The vector sum of two forces is perpendicular to their vector differences. In that case, the forces [CBSE PMT 2003]

Assertion : A point charge is brought in an electric field. The field at a nearby point will increase, whatever be the nature of the charge. Reason : The electric field is independent of the nature of charge.

Assertion : The temperature coefficient of resistance is positive for metals and negative for p-type semiconductor. Reason : The effective charge carriers in metals are negatively charged whereas in p-type semiconductor they are positively charged. [AIIMS 1996]

Two bodies with kinetic energies in the ratio of 4 : 1 are moving with equal linear momentum. The ratio of their masses is [CBSE PMT 1999]

The mechanical equivalent of heat J is [MP PET 2000]

A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose density and radius are, respectively, one-quarter and one-third that of planet A [AMU (Med.) 2001]

The factor not needed to calculate heat lost or gained when there is no change of state is [AFMC 1997; BHU 1997]

The average power dissipation in a pure capacitance in ac circuit is [DPMT 1987; MP PMT/PET 1998]

The electrochemical equivalent Z of any element can be obtained by multiplying the electrochemical equivalent of hydrogen with

Electroplating does not help in [AIIMS 1998]

When the distance between the charged particles is halved, the force between them becomes [MNR 1986]

Assertion : A dish antenna is highly directional. Reason : This is because a dipole antenna is omni directional.

Assertion : Magnetic moment of helium atom is zero. Reason : All the electron are paired in helium atom orbitals.

The capacitance of an air capacitor is \[15\mu F\]the separation between the parallel plates is\[6mm\]. A copper plate of \[3mm\] thickness is introduced symmetrically between the plates. The capacitance now becomes [MP PMT 1995]

Assertion : The basic of Laplace correction was that, exchange of heat between the region of compression and rarefaction in air is not possible. Reason : Air is a bad conductor of heat and velocity of sound in air is large.

Assertion : For a floating body to be in stable equilibrium, its centre of buoyancy must be located above the centre of gravity. Reason : The torque produced by the weight of the body and the upthrust will restore body back to its normal position, after the body is disturbed.

Assertion : Particle velocity and wave velocity both are independent of time. Reason : For the propagation of wave motion, the medium must have the properties of elasticity and inertia.

The characteristic impedance of a coaxial cable is of the order of [CPMT 2003]

The force constant of a weightless spring is 16 N/m. A body of mass 1.0 kg suspended from it is pulled down through 5 cm and then released. The maximum kinetic energy of the system (spring + body) will be [MP PET 1999; DPMT 2000]

Field at the centre of a circular coil of radius r, through which a current I flows is [MP PMT 1993]

Assertion : Sound would travel faster on a hot summer day than on a cold winter day. Reason : Velocity of sound is directly proportional to the square of its absolute temperature.

If two conducting spheres are separately charged and then brought in contact [NCERT 1979]

When a gas expands adiabatically [CPMT 1990]

Assertion : There is no dispersion of light refracted through a rectangular glass slab. Reason : Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.